After a month of set-up, scribing, and cutting, we have completed the Common Valley System, in the shop. The 3 common valleys, 2 ridges, and myriad common jack rafters are now ready to be taken down and then joined with the rest of the house frame, which is outside, ready for the valley scribes. This entire system doesn’t have one single square cut in it; every cut is a complex compound angle with degrees like 26.6°, 104°, 83.6°, etc. The 3D model of the system was indispensable while we were setting up all the component parts, as we could determine correct pitch and location information for every piece, at any position in the frame. I definitely would not have wanted to fabricate this without the 3D model as reference; the level of confidence it provides is awesome. Of course, this only works if the model, itself, is meticulously modeled and is perfect in the computer. Garbage in, garbage out is absolutely how this process works.